U.S. patent number 3,777,460 [Application Number 04/886,050] was granted by the patent office on 1973-12-11 for lawn conditioning machine.
Invention is credited to Frank Mokros.
United States Patent |
3,777,460 |
Mokros |
December 11, 1973 |
LAWN CONDITIONING MACHINE
Abstract
A lawn conditioning machine comprising grass raking tines. The
raking action is a natural reciprocal movement during which foreign
material is made free and gathered. The rake is angularly and
height adjustable to vary the depth of raking action. The tines are
removably supported so as to allow individual replacement in case
of damage. A detachable lawn conditioning device is provided for
performing other lawn conditioning functions.
Inventors: |
Mokros; Frank (North Bay Shore,
NY) |
Family
ID: |
25388270 |
Appl.
No.: |
04/886,050 |
Filed: |
December 17, 1969 |
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
642884 |
Jun 1, 1967 |
|
|
|
|
Current U.S.
Class: |
56/16.7; 172/21;
172/42 |
Current CPC
Class: |
A01D
76/003 (20130101); A01B 45/026 (20130101) |
Current International
Class: |
A01B
45/00 (20060101); A01B 45/02 (20060101); A01D
76/00 (20060101); A01d 051/00 () |
Field of
Search: |
;56/27,330
;172/21,42 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Kinsey; Russell R.
Parent Case Text
This application is a division of copending application Ser. No.
642,884, now abandoned, filed June 1, 1967 in the name of Frank
Mokros.
Claims
I claim:
1. A device comprising a frame, raking means, power means,
connecting means for connecting said power means to said raking
means to move said raking means in a path adjacent and
substantially parallel to the ground, first and second means
laterally spaced on said frame for slidably supporting said
connecting means.
2. A device as defined by claim 1, said frame including first and
second spaced members, said first means including a first bearing
member mounted on said first member, said second means including a
second bearing member mounted on said second member.
3. A device as defined by claim 2, a first shaft slidably mounted
in said first bearing member and a second shaft slidably mounted in
said second bearing member; said first and second shafts being
connected to said raking means.
4. A device as defined by claim 1, means for adjustably mounting
said frame means
for adjusting the angle of said raking means relative to
ground.
5. A device as defined by claim 4, including means for adjusting
the height of said raking means relative to ground.
6. A device as defined by claim 1, means for adjusting the angle of
said raking means so that an intermediate portion of said raking
means can be placed at a lower depth then the end portion of said
raking means.
7. A device comprising raking means, said raking means including a
shaft, tines, means for removably mounting raking tines on said
shaft, first and second support members, means for removably
connecting said support members to said shaft proximate the ends
thereof, first and second means for mounting said support members
for reciprocal movement, power means, means interconnecting said
first and second members, means connecting said last mentioned
means to said power means.
8. A device as defined by claim 7, means for adjusting the angle of
said raking means relative to ground.
9. A device as defined by claim 8, including means for adjusting
the height of said raking means relative to ground.
10. A device as defined by claim 7, means for adjusting the angle
of said raking means so that an intermediate portion of said raking
means can be placed at a lower depth then the end portion of said
raking means.
11. A power rake adapted to be steered by a walking attendant
comprising:
a ground supported mobile frame having a handle and four
wheels;
a traverse rake member having downwardly directed teeth and a
supporting structure movably supported on said frame for
longitudinal motion relative to said frame;
a power source on said frame:
and mechanically means interconnecting said power source and the
supporting structure of said rake to reciprocate the support
structure and rake longitudinally relative to said frame.
12. A power rake as set out in claim 11 wherein said power source
comprises:
a motor having an output member;
a transverse shaft rotably mounted on said frame;
drive means operatively connected between said motor output member
and said shaft;
a radial crank arm fixed to said shaft;
and a rigid link pivotally connected about parallel transverse axes
at its ends to said crank arm and rake supporting structure stem
respectively.
Description
BACKGROUND OF THE INVENTION
There are two main problems in lawn conditioning.
Firstly, the presence of dead grass and clippings and prostrate
living stems interfere with the growth of new grass or may smother
it completely. Various and diverse types of rotary power driven
rakes which dislodge such old dead material are well known in the
art. Examples of such rakes are shown and described in U.S. Pat.
No. 2,902,098, U.S. Pat. No. 2,987,866, U.S. Pat. No. 3,024,587,
U.S. Pat. No. 3,125,844, U.S. Pat. No. 3,217,474, and U.S. Pat. No.
3,211,483. These prior art rakes, however, are all rotary devices
and have not proved to be satisfactory.
Secondly, lawns, where the turf is subjected to packing action or
where turf hardens in areas where there is relatively little
moisture from rainfall during extended portions of the year, are
much in need of perforation to open the soil around the grass roots
for the reception of air, water, fertilizer, top dressing and other
agents for the stimulation of grass growth. Various power driven
devices have been produced for perforating soil such as those shown
and described in U.S. Pat. Nos. 2302944, U.S. Pat. No. 2303726,
U.S. Pat. No. 2347748, U.S. Pat. No. 3163235 and U.S. Pat. No.
3204703. All of these prior art devices are deficient in that they
are not able to be adjusted to meet the particular requirements of
the ground being perforated.
SUMMARY OF THE INVENTION
Briefly, the present invention is comprised of a wheel supported
frame member which supports a rake-aerator bar for reciprocating
movement. The rake-aerator bar has arcuate raking tines depending
therefrom in one direction and perforating spikes depending
therefrom in a substantially diametrically opposed direction. The
rake-aerator bar is adjustably mounted so as to selectively
position either the raking tines or aerating spikes in an operative
position.
The front wheels and rear wheels of the device are adjustably
connected to the frame so as to vary the depth and angle at which
the raking tines and aerating spikes operate.
When raking, wheel adjustment is made so that the raking tines
reciprocate in a path adjacent to the ground. When aerating, wheel
adjustment is made so that the perforating spikes are angularly
disposed to minimize tear and to meet the particular requirements
of the lawn under treatment.
The raking tines have an arcuate intermediate portion and a pointed
end portion. The arcuate intermediate portion is the leading
portion of the rake in one direction of movement and the pointed
end portion is the leading portion in the other direction of
movement thereby enabling the rake to simultaneously rake and
gather.
An attachment is adapted to be detachably connected to the
rake-aerator bar for performing an additional lawn care function.
The rake aerator bar is raised to an above ground non-operational
position where the attachment is employed. Upon operation, only the
attachment is in position to function.
DRAWINGS
FIG. 1 is a perspective view of the present invention.
FIG. 2 is a top plan view of the present invention, some parts
being broken away.
FIG. 3 is a sectional view taken on line 3--3 of FIG. 2
illustrating the operation of the raking tines.
FIG. 4 is a sectional view taken on line 4--4 of FIG. 1 and
illustrating, more particularly, the manually operated height
control member.
FIG. 5 is a sectional view taken on line 5--5 of FIG. 3.
FIG. 6 is an exploded view of the rake aerator bar.
FIG. 7 is a fragmentary perspective view of the adjustable
connection between the rear wheel and the frame of the device.
FIG. 8 is a fragmentary diagramatic view illustrating the operation
of the perforating spikes.
FIG. 9 is a fragmentary diagramatic view illustrating angular
adjustment of the raking tines.
FIG. 10 is an exploded view of the rake-aerator bar having an
auxiliary lawn conditioning device detachably connected
thereto.
DETAILED DESCRIPTION
Referring to FIGS. 1, 2 and 3, the invention comprises a wheel
supported frame member which supports a rake-aerator bar 1 for
reciprocating movement. The frame member comprises parallel side
frame members 2 and 3 which are rigidly interconnected at the front
by rods 4 and 5 and are interconnected at the rear by rods 6, 7 and
8. The rake-aerator bar 1 includes a supporting shaft 9, having
raking tines 10 extending therefrom in one direction and
perforating spikes 11 extending therefrom in a substantially
diametrically opposite direction. The individual oppositely
disposed tines 10 and spikes 11 are integrally joined and formed
from the same sheet of material 12.
Referring to FIGS. 1 and 2, a handle 13 is bolted to the frame side
member 2 and 3 at 14 and 15, respectively. Handle 13 includes a
pair of handle bars 16 and 17 which extend upwardly and rearwardly
from the rear frame structure. The handle bars 16 and 17 are
provided at their extreme ends with hand grips 18 and 19. The
device is adapted to be unidirectionally manually propelled (or
power operated as hereinafter explained) in the direction indicated
by arrow A in FIG. 1 so that the operator walks in advance of
machine travel. If preferred, handle 13 could extend forwardly of
the machine so that the operator would walk in a trailing path to
machine travel, or in the alternative, the handle 13 could be
pivotally mounted by conventional means to the frame side members 2
and 3 so as to leave the method of handling to the whim of the
operator.
As shown in FIGS. 1 and 3, the raking tines 10 are in the operative
position and are adapted to be reciprocated in a path adjacent and
substantially parallel to the ground. Referring particularly to
FIG. 3, on the rearward stroke (indicated by arrow A), raking tines
10 function to loose and gather foreign material between healthy
growths of grass. On the forward stroke, (indicated by arrow B)
arcuate intermediate portions 20 of raking tine 10 is the leading
portion. Due to the arcuate design of intermediate portion 20, the
raking tines 10 are prevented from returning loose material
gathered on the rearward stroke. As hereinbefore described, the
device is adapted to be unidirectionally propelled by handle 13 in
the direction of arrow A and as a result, foreign material will be
gathered as the machine moves along.
The side frame members 2 and 3 support the rake-aerator bar 1 for
reciprocating movement. Referring to FIGS. 1, 2 and 3, the ends of
support shaft 9 of rake-aerator bar 1 extend through slots 21 and
22 in parallel side frame members 2 and 3 respectively and are
connected to a support assembly 23 which is mounted for
reciprocating movement by pairs of tubular sleeves or slide bearing
members 24 and 25 on side frame members 2 and 3 respectively. The
ends of support shaft 9 are connected to support plates 26 and 27
of support assembly 23, by means hereinafter described. Support
plates 26 and 27 are rigidly interconnected by rods 28, 29 and 30
and are bolted to and supported by shafts 31 and 32 respectively.
Shafts 31 and 32 extend through pairs of slide bearing members 24
and 25, respectively, and are adapted to reciprocally slide freely
therethrough. Pairs of bearing members 24 and 25 are mounted on
pairs of L shaped brackets 33 and 34, respectively, which are
bolted to side frame members 2 and 3. Each of the L shaped brackets
33 and 34 have U shaped cut out portions 35 to allow passage of
shafts 31 and 32 therethrough.
A motor 36 comprising an internal combustion engine is provided to
reciprocate the aerator rake support assembly 23. Motor 36 is
mounted on parallel plates 37 which are bolted by J shaped bolts 38
to rods 6 and 7 of the frame. While an internal combustion engine
is illustrated, any type of motor or power plant can be
employed.
In order to reciprocate the aerator support assembly 23, a suitable
transmission is provided as shown in FIG. 1. Motor 36 has a drive
shaft 39 which has keyed or otherwise secured thereto a pully wheel
40. Trained about the pulley wheel 40 is a V belt or the like 41
and this belt is in turn trained about a large pulley wheel 42
keyed or otherwise secured to a shaft 43. If desired, any
conventional transmission arrangement can be used in place of
pulleys and belt such as e.g. a sprocket and chain arrangement.
Shaft 43 is supported for rotation in bearing block 44 which is
mounted on and supported by parallel support plates 37 (see FIG.
3). A reciprocating shaft 45 is pivotally connected to pulley wheel
42 at an off center position at 46 so as to translate the rotary
motion of the pulley 42 to reciprocal motion. The opposite end of
the shaft 45 is pivotally connected to rod 29 of the aerator rake
support assembly 23. The speed of the internal combustion engine or
motor 36 may be controlled by any conventional means such as, e.g.
a flexible cable 47 to an operating lever 48 mounted on a pivot
49.
As hereinbefore described, the machine is adapted to be manually
propelled along a ground surface. Optionally, the machine may be
propelled by motor 36 by means of conventional drive means between
the motor 36 and either the front or rear wheels.
HEIGHT ADJUSTMENT OF RAKE-AERATOR BAR
The aerator-rake bar 1 is adjustably mounted to vary the depth at
which the raking tines 10 and perforating spikes 11 operate so as
to meet the particular requirements of a selected lawn. With a good
lawn, the depth of raking and perforating can be kept to a minimum
thereby minimizing damage to good growths of grass. With a poor
lawn the opposite holds true. The rake-aerator bar 1 can be raised
above operating level so as to reduce the load when starting the
motor 36.
Referring to FIGS. 1 and 2, the frame member supporting the
rake-aerator bar 1 is supported by pairs of front and rear wheels
50 and 51, respectively. The front wheels 50 are pivotally
connected to the frame member for swinging movement so as to permit
height adjustment of the rake-aerator bar 1 relative to the ground.
For this purpose, the front wheels 50 are rotatably mounted on
brackets 52 by stub shafts 53. Brackets 52 are pivotally connected
to the side frame members 2 and 3 by pivot pins 54 which are
integral with and extend axially of front frame rod 4. Brackets 52
are interconnected by parallel rods 55 and 56 so that both front
wheels 50 are adjusted to the same extent.
Referring to FIGS. 1 and 4, a manually operated lever bar 57 having
a hand grip 58 is provided for adjusting the height of the
rake-aerator bar 1. The lever bar 57 is pivotally connected by a
pivot pin 59 to a support plate 60 which in turn is bolted to the
handle 13. The support plate 60 contains apertures 61 which are
adapted to receive a locking pin 62 which also extends through an
aperture 62A in lever bar 57 so as to lock the lever bar 57 in a
selected position. The lever bar 57 is under tension provided by a
spring 63 which extends between the head of pivot pin 59 and the
surface of the lever bar 57.
The lever bar 57 is operatively connected by a rod 64 to rod 55 of
the front wheel support assembly. Rod 64 has a terminal portion 65
which forms a pivot pin and extends through an aperture 66 in lever
bar 57. A cotter pin 65A prevents lateral displacement of terminal
portion 65. The opposite end of rod 64 is bolted to plate 67 which
is apertured at 68 to receive rod 55 of the front wheel support
assembly.
In operation, the lever bar 57 is initially moved and locked into
an aperture 61 designated as X in FIG. 1. Movement of the lever bar
57 to position X will move the rod 64 and in turn, pivot the front
wheel support assembly, so that the wheel support brackets 52
assume the position shown in solid lines in FIG. 5. In this
position, the wheel support brackets have swung the front wheels 50
downwardly sufficiently so that the aerator-rake bar 1 is placed in
an above ground level and engine load is reduced for ease in
starting. After the engine is started, the lever bar 57 is moved
forwardly to any of the other apertures 61 and the aerator-rake bar
1 assumes an operative position, i.e. at or below tire level as
shown e.g., in broken lines in FIG. 5. The depth to which the
aerator-rake bar 1 operates can be varied by moving the lever bar
57 to a selected one of the other apertures 61 as conditions of a
particular lawn require.
RAKE-AERATOR BAR
A most important feature of the present invention is its capability
of converting from a raking device to a perforating device. The
rake-aerator bar 1 has, as hereinbefore described, raking tines 10
extending therefrom in one direction and perforating spikes 11
extending therefrom in a substantially diametrically opposite
direction. The tines 10 and spikes 11 are integrally joined and
formed from the same sheet of material 12, hereinafter generically
referred to as diverse conditioning element 12. A still further
feature of the present invention is that diverse conditioning
elements 12 are individually removably mounted.
Referring to FIG. 6, diverse conditioning elements 12 forming the
raking tines 10 and aerating spikes 11 are removably mounted on
support shaft 9 so that in case of damage there is a need only for
replacing one diverse conditioning element 12 and not the entire
bar 1. For this purpose, diverse conditioning element 12 has a
rectangular aperture 69 which is adapted to slide over support
shaft 9. Shaft 9 has a rectangular cross section so that each of
the diverse conditioning elements 12 are locked against pivotal
movement. Spacing collars 70 are also mounted on support shaft 9
and disposed between adjacent diverse conditioning elements 12.
Washers 71 and locking collars 72 are also mounted on support shaft
9 adjacent the outer surfaces of end diverse conditioning elements
12A and 12B. Set screws 73 extend through collars 72 so as to lock
the collars in place and in turn to prevent lateral movement of the
diverse conditioning elements 12. In case of damage to a
conditioning element 12, the collar 72 nearest the damaged element
12 is removed and the conditioning elements 12 together with the
spacing collars 72 are removed by sliding the same off support
shaft 9. The damaged element 12 is replaced by a new element, and
the rake-aerator bar 1 is reassembled.
The perforating spikes 11 may be placed in an operative position by
a simple adjustment. Referring to FIG. 6, the ends of support shaft
9 extend freely through slots 21 and 22 in side frame members 2 and
3. Shaft 9 has threaded end portions 74 integrally connected
therewith and axially extending therefrom. End portions 74 have
diametrically opposite grooved portions 75. Threaded portions 74
extend through apertures 76 in support plates 26 and 27 of support
assembly 23. A locking plate 77 having an aperture 78 with
diametrically opposed projections 79 keys to the grooved threaded
portion 74. The locking plate 77 has apertures 80 and 81 and the
support plates 26 and 27 have aligned apertures 82 and 83 adapted
to receive locking pins 84 and 85 for locking the plate 77 and in
turn, the support shaft 9 of the aerator-rake bar 1 against
rotation. Finally, bolts 86 are threaded to end portion 74 so as to
prevent axial movement of the shaft.
If it is desired to place the aerating tines in an operative
position, bolt 86 together with locking plate 77 is removed.
Removal of plate 77 carries with it locking pins 84 and 85 which
are frictionally locked to the plate 77 by protuberances 87.
Support shaft 9 is rotated through 180.degree. thereby placing the
perforating spikes 11 in an operative position. The locking plates
77 and bolts 86 are again placed in position and the perforating
spikes 11 are ready for operation.
ANGULAR ADJUSTMENT OF RAKE-AERATOR BAR
The frame supporting the aerator- rake bar 1 is selectively
adjustable so that the perforating spikes 11 may be tilted toward
ground for operation thereof. This provides two important features
of the present invention. Firstly, the angle of perforation can be
adjusted to meet the particular requirements of a lawn under
treatment. Secondly, the angle at which the rake is disposed can be
varied so as to provide an additional means for adjusting the
height of the rake tines 10 relative to the ground.
The frame for rake-aerator bar 1 is, as hereinbefore described,
supported by rear wheels 51. The rear wheels 51 are pivotally
connected to the frane member so that the frame, and in turn, the
perforating spikes 11 may be tilted toward the ground for
penetration thereof upon reciprocation of the rake-aerator bar
1.
Referring to FIG. 2, and 7, the rear wheels 51 are mounted on stub
shafts 88 extending from lever arms 89. Lever arms 89 are pivotally
connected by a pivot pin 90 to a support plate 91. Support plate 91
is fixedly connected to support pins 92 and 93 integral with and
extending axially of rear frame rods 7 and 8, respectively.
Apertures 94 are provided in support plate 91 which are adapted to
be selectively aligned with an aperture 95 in lever arm 89. A
locking pin 96 is adapted to be extended through aperture 95 and a
selected aperture 94 so as to position the rear wheels in an
adjusted position. By swinging the lever arm 89 downwardly, the
rear of the support frame is raised as shown in broken lines in
FIG. 8. It is to be understood that plate 91 may be made larger and
additional apertures 94 provided so that the rear of the frame can
be raised to a greater degree.
Referring to FIG. 8, the perforating spikes 11 are periodically
propelled into the ground when support frame is tilted as shown in
broken lines in FIG. 8. The operator moves the machine rearwardly
(in the direction of the arrow A). The spikes 11 are inclined
forwardly so as to minimize any tearing of the surface of the
ground as the operator moves the machine. If a good lawn is being
perforated, the rear of the frame is only slightly raised so as to
effectively eliminate tearing and to keep perforation to a minimum
depth. As hereinbefore described, the depth of perforation can be
further controlled by adjustment of the front wheels 50.
Referring to FIG. 9, the frame is shown in an angularly adjusted
position as in FIG. 8, except that now the raking tines 10 are
placed in operative position. It will be noted that the pointed end
10A of the tines are now in a raised position relative to the
ground. If the rake is operating under these conditions, only the
top surface will be raked. This is desirable when a lawn in good
condition is being raked as it minimizes the danger of raking out
good growths. While a similar action would take place by merely
adjusting the height of the rake-aerator bar 1, it is pointed out
that the need for a separate height control mechanism, while
desirable, is not essential to the present invention. In addition,
height adjustment in this manner assists in the gathering function
as the portion of tine adjacent pointed end 10A bears against the
ground and tends to assist in gathering loose material which falls
below the pointed end level.
ATTACHMENT
The present invention is further capable of performing additional
lawn care functions by conditioning elements of the type which are
normally moved adjacent the ground such as e.g. hoes, plows,
etc.
Referring to FIG. 10, an attachment comprising a bamboo rake 97
having downwardly depending tines 98 is provided. It is to be
understood that rake 97 is shown merely as one example of
conditioning elements of the type which are moved adjacent the
ground. The bamboo rake 97 is adapted to be attached by yoke member
99 and 100 which depend from support arms 101 and 102. Yoke members
99 and 100 slide over support shaft 9 of the aerator-rake bar 1 and
are locked in place between the end conditioning elements 12A and B
and locking collars 72.
The rake-aerator bar 1 is raised to an above operational level
before the rake 97 is attached. The rake 97 is attached and the
tines 98 are of such length as to flexibly bear against the ground.
In operation, the rake 97 merely performs a gathering function
thereby completely eliminating any danger of tearing into the
lawn.
SUMMARY OF OPERATION
Referring to FIG. 1, the raking tines 10 are in an operative
position. The manually operated lever bar 57 is moved to position
X. Motor 36 is started. Lever bar 57 is moved forwardly and locked
to an aperture 61 selected in accordance with the desired raking
depth. Movement of lever bar 57 pivots front wheel support plates
52 and 53 about pin 54 so as to swing the front wheels upwardly
relative to side frame member 2 and 3 (see broken lines in FIG. 5).
As a result, the raking tines 10 are lowered into ground contact.
The raking tines 10 reciprocates in a path adjacent to the ground
as shown in FIG. 3 and the machine is moved in the direction
indicated by arrow A. As a result, foreign material is made loose
and gathered.
Referring to FIG. 6, and 8, if it is desired to aerate, the rake
aerator-bar 1 is adjusted so as to place the perforating spikes 11
in an operative position. Firstly, nut 86 and locking plate 77 are
removed. The support shaft 9 of the rake-aerator bar 1 may then be
rotated through 180.degree. thereby placing the perforating spikes
11 in an operative position. Locking plate 77 and nut 86 are again
attached thereby locking the perforating tines 11 in position.
Referring to FIG. 7, the rear of the side frame member 2 and 3 are
then raised by swinging lever arm 89 downwardly and locking it in a
selected aperture 94. The side frame members assume a tilted
position shown in FIG. 8. Motor 36 is started and the perforating
spikes 11 are periodically propelled into the ground. If desired,
the depth of perforating can be adjusted by manually operated lever
bar 57.
Referring to FIG. 9, the raking tines 10 are shown in an operative
position. The pointed end 10A of the tines 10 are in a raised
position relative to the ground as a result of raising of the rear
of the frame. In this position only the top layer of the lawn will
be raked.
Referring to FIG. 10, an additional lawn conditioning member, such
as that shown at 97, can be attached to the rake-aerator bar 1 if
desired. In operation, member 97 reciprocates in a path adjacent
the ground to perform its function in the same manner as raking
tines 10. When in operation, the raking tines 10 are above ground
and do not interfere in any way with the operation of member
97.
The foregoing description and accompanying drawings clearly
illustrate pereferred embodiments of this invention but it will be
understood that changes may be made within the scope of the
following claims.
* * * * *